Door-latch.



J. H. McCANN.

DOOR LATCH.

APPLICATION FILED JUNE 14, 1915.

Patented Dec. 28, 1915.

an sra rns rarnwr orrrcn.

JOHN H. MGCANN, OF BANGOR, MAINE.

DO OR-LATC'I-I.

To all whom it may concern Be it known that I, JoHN H. MCCANN, a citizenof the United States, residing at Bangor, in the county of Penobscot andState of Maine, have invented certain new and useful Improvements inDoor-Latches, of which the following is a specification.

This invention relates to door locks and latches, and has for its objectthe provision of'a simple and inexpensive device whereby the occupant ofa room may effectually lock the door against opening from the outside.

A secondary object of the invention is to provide a device for thestated purpose which will be composed of very few parts and may bereadily applied to looks already in place.

Other incidental objects of the invention will appear as the descriptionof the same proceeds.

The invention is illustrated in the accompanying drawings, and consistsin certain novel features which will be particularly pointed out in theclaims following the detailed description.

In the drawings: Figure 1 is a perspective view of a portion of a doorhaving my improved device applied thereto; Fig. 2 is a View showing thedevice applied to a door and in position to prevent opening of the door,the working parts being shown in horizontal section; and Fig. 8 is adetail perspective view showing the several parts of the devicedisassembled but in their proper relative positions.

In the drawings, 1 indicates a swinging door of the usual form, and 2 isthe door frame provided with a keeper or recess adapted to be engaged bythe latch 3 slidably mounted in the door.

In carrying out my invention, I form in the inner face of the latch,near the outer end of the same, a vertical groove 4, and upon the innerside of the door immediately adjacent the edge of the same, I secure ahousing or bracket 5 which may be secured to the door by screws or otherfastenings 6, as clearly shown in Fig. 1. This bracket presents acentral angular portion adapted to house a locking plate 7 which has alip 8 at one end projecting from the housing and adapted to engage thegroove 4, as clearly shown in Figs. 1 and 2. This locking plate isfurther provided within the housing with an enlarged body 9 internallythreaded, as

Specification of Letters Patent.

Application filed June 14, 1915.

Patented Dec. 28, 1915.

Serial No. 33,955.

5 shown at 10, so as to receive the threaded extremity of a screw 11which is swiveled within the outer wall of the bracket 5 and equippedwith a milled head 12 whereby it may be easily manipulated.

It is thought the use of the device will be readily understood from theforegoing description, taken in connection with the accompanyingdrawings. I

The door is closed in the usual manner, and the latch springs intoengagement with the door frame. The lip 8 on the locking plate entersbetween the door and the door frame, there usually being a space betweenthe edge of the door suflicient to admit the lip which may easily havethe requisite strength without being very thick. If, however, the doorand the door frame are very closely fitted, a groove or recess may beformed in either the door or the frame in order to acccommodate the lip.After the door is closed, the screw 11 is rotated about its own axis andthe threaded engagement of said screw with the nut or enlarged body 9will cause the locking plate to ride toward the door and the lip 8 toenter the groove 4, as will be readily understood. Releasing movement ofthe latch will then be prevented inasmuch as the lip 8 entering thegroove l and bearing against the edge of the door holds the latchpositively stationary and in engagement with the door frame. In order toopen the door, the locking plate will first be withdrawn from engagementwith the latch by manipulation of the screw 11 and it is, therefore,obvious that the door cannot be opened from the outside.

The device is obviously simple and inexpensive and may be easily appliedto any door already in position. In appplying the device to an old door,a groove is filed in the inner face of the latch immmediately adj acentthe edge of the door, as will be readily understood, after which thebracket and locking plate are secured to the door. The bracket should beof such dimensions that it will engage the edges of the locking plate sothat said plate may slide in the housing to or from the door but will beprevented from having any turning movement so that it cannot rotate withthe screw but will be caused to ride along the screw when the screw isrotated. The screw may be swiveled in any desired manner in the outerwall of and the door frame the bracket so that it cannot movelongitudinally through the wall after having been assembled therewith.

Having thus described the invention, what is claimed as new is 1. Thecombination with a door, and a latch mounted therein and provided with avertical groove in its inner face, of a looking plate mounted upon theinner side of the door for bodily sliding movement but held againstpivotal movement and provided with a lip projecting across the edge ofthe door to'engage said groove in the latch, and means mounted on thedoor for movingsaid locking plate into and out "of engagement withthelatch. V

2. The combination with a door, and a latch mounted therein, of abracket secured upon the inner face of the door, a locking plate fittedin said bracket for bodily sliding movement 'and 'having a lipextendingfrom the bracket and around the edge of the door to engage thelatch, and 'means carried by the bracket to move the locking platebodilyto and from the door and thereby carry the lip into and out'of'e'ngagement with the latch.

3.The combination with'a dooryand a latchfmou'nted therein, of'a bracketsecured upon the inner face of the door and having an angular hollowbody, a locking plate slidably fitted in'said angular hollow bodyandheld against rotation thereby and adapted to'engage the latch, and anadjusting'screw mounted in' the outer'wall -of said body and having athreaded engagement with the said locking plate.

l. The combination with a door, and a Copies of this patent may beobtained for five cents sliding latch mounted therein, of a bracketsecured on the inner face of the door adjacent the free edge of the sameand having parallel sides and an open end, a locking plate mounted onsaid bracket for free bodily sliding movement between the sides thereofand held against pivotal movement by said sides, a lip projecting fromsaid look ing plate through the open end of the bracket and across theedge of the door to engage the latch, and means mounted on the bracketand engaging the locking plate to slide the samebodily toward and fromthe door.

5. The combination with a door, and a sliding'latch mounted therein, ofa bracket secured on the inner face of the door adjacent the "free edgeof the same and having an open end, the latch being provided in itsinner face with a vertical groove lyingadjacentthe free edge of the doorand outwardly beyond the same when the latch is projectecba lockingplate mounted inthe bracket for free bodily sliding movement andheldag-ainst pivotal movement by said bracket, a lip pro ect1ngfrom'saidlo'cking plate across the free edge of the door'toengage'thegroove in thelatch, and a screw swiveled'in the bracketandhaving a threaded engagement with the locking platewhereby to move thesame bodily towardand from the doorand thereby carry the said lip intoor'olrlit of'engagement with the groove in the late In testimony whereofI affix my signature.

JOHN H. McGANN. [n 8.

each, by addressing the Commissioner of Patents,

Washington, D. G.

